Inserting a link without nofollow on Flickr is quite easy, because there is a bug on the functions that add the 'rel="nofollow"' attribute on the external links.
So you can go on http://blog.flickr.net/en (PR9) choose a photo, add a new comment and insert in that comment a link with this href:
href="http://www.mywebsite.com/#http://www.flickr.com/photos/"
The Flickr function will check the URL entered and thanks to the hash before the FlickrURL, #http://www.flickr.com/photos/, your link will be parsed as an internal URL, without having been created of the nofollow attribute.
href="http://www.mywebsite.com/#http://www.flickr.com/photos/"
The Flickr function will check the URL entered and thanks to the hash before the FlickrURL, #http://www.flickr.com/photos/, your link will be parsed as an internal URL, without having been created of the nofollow attribute.
GOOGLE, instead, will evaluate your link in the right way and will follow it.
The funny thing is that to fix this bug would require just a few minutes to Flickr, anchoring their RegExp parser to the very beginning of the entered URL with the ^ symbol.